I dont have one on mine,I spent age's trying to decide which to go for but a few tuning company's told me not to bother as the standard set up work's more than good enough,but if you must have that throaty sound and look's under the bonnet go for it,but it can cause a loss of performance over all(but that's just what they say)im sure other's will disagree[^]
Std airbox, CAI pipe and green cotton filter. Put it this way, from just std box, no other changes, it made my clutch start sliping!! Big torque increase, nice and subtle, costs about ?50 all in including the panel filter!
Second that MrSean. I had a Carbonio on my 1.8T and when I was in the process of turning the car back to stock I had to put the stock airbox back on with a new filter - I was amazed at how the performance improved and can fully understand GaryM's figures when he did back-to-back testing with his Dynatwist and stock setup.
However when I had a Carbonio on my R32... Well... that was a different story 
Indeed is not just a case of dense air, is as much about how fast it gets there! have used this method with 3 friends using Green Cotton Panel filter and drilled box and all agree with the results over an cai.....
just fitted a carbornio CAI on my 1.8t today and im made up with the sound, i would defo say its more torquie too!! more cold dense air the better and the pipe is more smooth flowing than the standard box,
could any one tell me if they have fitted a breather pipe filter on theres, i cant seeem to find a pipe that needs a filter to go on, no breather pipe came off my air box, my cars a year 2000, w reg agu engine???????
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